What the Dollar Index is
The US Dollar Index (DXY) is a single number that measures the value of the US dollar against a basket of six major currencies. It was launched in 1973 and its composition has barely changed since:
- EUR — 57.6%
- JPY — 13.6%
- GBP — 11.9%
- CAD — 9.1%
- SEK — 4.2%
- CHF — 3.6%
A rising DXY means the dollar is strengthening against this basket. A falling DXY means it's weakening. It is the closest thing FX markets have to a "dollar barometer."
Why DXY matters for your invoices
If you have an invoice due in EUR/USD, GBP/USD or any other USD pair, the movement in your pair is a combination of two things: (1) what the dollar is doing broadly, and (2) what your specific counter-currency is doing.
DXY separates those two forces. When EUR/USD falls 2% and DXY is up 2%, the story is "the dollar rallied against everything." When EUR/USD falls 2% and DXY is flat, the story is "the euro weakened." Those two situations have completely different implications for whether the move will continue.
How to interpret DXY moves
- DXY up more than 1.5% in a month — broad dollar strength. Every USD pair is being pushed by the same force. Wait-and-see is often the wrong instinct because the move is thematic and may run further.
- DXY between ±0.5% and ±1.5% — mild directional dollar bias. Contributes to your pair's movement but doesn't dominate it.
- DXY within ±0.5% — roughly flat. Your pair's movement is driven by counter-currency factors, not the dollar. Watch that side's economic calendar.
Why DXY matters even for non-USD pairs
USD is the world's reserve currency and its liquidity backbone. When DXY moves sharply, risk sentiment shifts globally: EUR/GBP, AUD/JPY and other non-USD pairs can move in sympathy through carry-trade unwinds and safe-haven flows. DXY is a leading indicator for FX volatility broadly, not just USD pairs.
Where DXY appears in FX Foresight
DXY sits in the rate ticker at the top of the authenticated dashboard, updated daily. On the trade-analysis page for any USD invoice, the "Dollar context" section tells you whether your pair's recent move is a dollar story or a pair-specific story. On the Currency Volatility Reference page, USD pairs show a DXY correlation line alongside their own volatility, so you can see how much of the movement is attributable to broad dollar trends.